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They also joined the designer and pals for dinner afterward at Omar’s, where Siriano had chef Georges Mokbel “add an extra course to the menu during dinner so they could all fuel up for dancing later.”

The group headed to Rose Bar for an official after-party, where Hamm and Siriano chatted on a sofa as “Coco Rocha and Isabelle Fuhrman played pool wearing full Siriano gowns,” said a source.